Recently, Mutsuki-chan has been showing up whenever Sensei is busy. While she's there, she has been pulling off naughty pranks. She gives "<i>suggestive</i>" massages, takes baths together... Her teasing has been getting more intense and finally, it escalated to the nap room... But there’s a certain reason behind Mutsuki-chan’s mischief that she can’t tell Sensei... Though she loves to tease, Mutsuki-chan is filled with warmth, kindness, and a nurturing side—so please show her lots of affection!